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Description
When a parse action raises an IndexError, it does not bubble up the exception message as it would other types of exceptions. This makes it hard to debug how/why my parse action is failing if it raises an IndexError.
minimal example:
import pyparsing as pp
def parse_hello(
_string: str, _location: int, _tokens: pp.ParseResults
) -> None:
print(f"parsed {_tokens}")
raise Exception('this works ok')
def parse_world(
_string: str, _location: int, _tokens: pp.ParseResults
) -> None:
print(f"parsed {_tokens}")
raise IndexError('this does not')
hello = pp.Keyword("hello").set_parse_action(parse_hello)
world = pp.Keyword("world").set_parse_action(parse_world)
parser = pp.ZeroOrMore(hello | world)
parser.run_tests([
"hello",
"world"
])outputs
parsed ['hello']
hello
FAIL-EXCEPTION: Exception: this works ok
parsed ['world']
world
world
^
ParseException: Expected end of text, found 'world' (at char 0), (line:1, col:1)
FAIL: Expected end of text, found 'world' (at char 0), (line:1, col:1)
which properly bubbles up the exception raised when parsing "hello" but fails with an ambiguous error when parsing "world".
It should print FAIL-EXCEPTION: IndexError: this does not even if the parse action raises an IndexError
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